PowerBI-將日期轉換為星期 (附日期轉換表 & 自定義數字格式 & 轉換函數)

日期格式轉換表：

---

---

自定義格式轉換：

=FORMAT(SUM(Table[Field]),"0.00%") 

 

---

---

基礎函數之轉換函數：

---

---

實踐 #1：

表：表有字段From_Date，Week_Code (1-7)

需求：添加切片器WEEKDAY顯示值Monday，Sunday，Monday，Tuesday，Wednesday，Thursday，Friday，Saturday。
　　選擇Monday時，顯示每月最后一個禮拜一的數據。

實現方式一：

 1，SQL只提取每月最后一周的數據
  2，添加計算列 weekday1，表達式如下：

Weekday1 = IF('Bonus'[WEEK_CODE]="7","Sunday",
IF('Bonus'[WEEK_CODE]="6","Saturday",
IF('Bonus'[WEEK_CODE]="5","Friday",
IF('Bonus'[WEEK_CODE]="4","Thursday",
IF('Bonus'[WEEK_CODE]="3","Wednesday",
IF('Bonus'[WEEK_CODE]="2","Tuesday",
IF('Bonus'[WEEK_CODE]="1","Monday",
"Blank"
)))))))

　3， 將weekday1 設置為切片器后，排序亂了

　　解決：選擇字段，點擊按列排序，選擇Week_Code，保存后切片器按1-7排序

---

實現方式二： 

  添加計算列weekday2，表達式如下：

weekday2 = Format('Bonus'[FROM_DATE],"DDDD")

　　效果與方式一一樣。

 　　但是這個表達式不適用於直連模式

         

---

---

實踐 #2 - 歷史周顯示每周最后一天的數據，本周顯示所有天的數據
 需求： 添加WeekFilter，過去周顯示每周最后一天的數據，本周顯示所有天的數據

實現步驟：
Step1 - 寫SQL在D_Date表里添加Week_code

CASE
 WHEN DAY_OF_WEEK = 'Sunday' THEN 1
 WHEN DAY_OF_WEEK = 'Monday' THEN 2
 WHEN DAY_OF_WEEK = 'Tuesday' THEN 3
 WHEN DAY_OF_WEEK = 'Wednesday' THEN 4
 WHEN DAY_OF_WEEK = 'Thursday' THEN 5
 WHEN DAY_OF_WEEK = 'Friday' THEN 6
 WHEN DAY_OF_WEEK = 'Saturday' THEN 7 --Saturday 為每周最后一天
END AS WEEK_CODE

Step2 - 在D_Date表添加計算列，將本周的weekcode置為 7

Week_Filter =
Var dateweek = YEAR('D_DATE'[DAY_DATE])*100 + WEEKNUM('D_DATE'[DAY_DATE])
Var thisweek= YEAR(NOW()) *100 + WEEKNUM(NOW())
RETURN
IF(dateweek = thisweek,7,'D_DATE'[WEEK_CODE])

Step3 - 在視圖頁面添加Filter ，Week_code = 7
實現結果：

 

 

 

感謝所有指點小萌新的大神們。。。